“…This may explain the fact that the mechanism of action of some common cancer treatments (e.g., radiation, inorganic compounds, tyrosine kinase inhibitors, monoclonal antibodies, protease inhibitors, pyrimidine analogues, alkylating agents, and anthracyclines) relies on oxidative stress and ROS-dependent apoptosis [ 286 , 287 , 288 , 289 , 290 , 291 ]. OLE and HT cytotoxic actions themselves in part depend on ROS generation [ 57 , 59 , 63 , 75 , 85 , 88 , 101 , 102 ]; moreover, 200 μM OLE reduced HIF-1α mRNA and protein levels in HNE-1 and HONE-1 nasopharyngeal cancer cell lines [ 278 ], and pro-apoptotic OLE concentration corresponding to 100 μM was able to increase ROS production in MDA-MB-231 cell line, with the maximum peak obtained after 4 h incubation [ 51 ].…”